Hi, Thank you for your query. 1. If she has woken up with vertigo, and it occurs on change of position such as lying down or getting up, is of short duration, has a latent period of a few seconds between change of head position and onset of vertigo, occurs on turning sides while lying in bed, occurs on looking at a top shelf, then it is BPPV (Benign Paroxysmal Positional Vertigo). It is curable. 2. BPPV and Cervical Spondylosis would worsen after such extensive dental treatment. This has to do with the abnormal posturing of the head for long periods of time, rather than the proximity of the inner ear to the dental work. Dizziness may also be drug induced. 3. I am assuming that her hearing (Pure Tone Audiogram) and middle ear pressure (Tympanogram) is normal and Meniere s Disease has been ruled out along with common causes such as anemia (low hemoglobin), blood pressure changes (Orthostatic hypotension). (Meniere s Disease includes fluctuating hearing oss, Vertigo, Tinnitus and Fullness in the ear). 4. An MRI Scan may be done so as not to miss the rare causes, however 99% Scans are normal. A Neurologists opinion is recommended. Central (brain related) vertigo will last all day long and even occur during walking or without change of head position. MS is rare and has many other symptoms and signs. 5. Direct observation of any vertigo nystagmus always helps in the diagnosis. An ENT Opinion is recommended before the MRI. Regards.